Good question! Actually Google's AI software is acting as a person and answering the phone for you and asking the caller why they are calling. You can elect to disable save to text etc if you wish but I like having the callers response transcribe. Google's call screener is far more advanced by multiples than what Apple has done with Live Voicemail.
Google demoed their Google Assistant where it called a hair salon and a restaurant to book an appointment on behalf of the caller. The person on the receiving end had NO idea they were talking to AI. Google's Assistant also handles the
Call Screener. The restaurant call was even more impressive because the call didn't go exactly, according to plan but Google's AI understood and still handled it with ease with the party on the other end having no idea that they were having a conversation with Google's AI.